WebSphere Application Server 7.0 集群构建指南

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"WAS7集群搭建操作手册,从was安装到集群搭建,内容详细" 在IT行业中,WebSphere Application Server(简称WAS)是IBM提供的一款企业级应用服务器,用于部署和管理Java EE应用。在大型分布式环境中,为了提高系统的可用性、可扩展性和负载均衡,通常会采用集群部署。本篇将详细讲解如何搭建WAS 7.0的集群。 1. 集群概念与优势 集群是一种将多个独立服务器组合成一个逻辑单元的技术,它可以提供高可用性、负载均衡和故障转移功能。在WAS 7.0中,集群由多个节点组成,每个节点都运行着相同的服务器实例,共享资源,共同分担负载。 2. 集群搭建准备 - **硬件需求**:至少需要两台服务器,一台作为集群管理器(Cluster Manager),其余作为应用程序服务器(Application Server)或集群节点。 - **软件需求**:WebSphere Application Server Network Deployment 7.0的安装介质。 3. 集群管理器安装 - 安装过程中,选择"WebSphereApplicationServerNetworkDeployment"安装类型,确保包含集群管理所需的组件。 - 按照安装向导进行,同意许可协议,选择合适的安装路径。 4. 节点安装 - 在每个应用程序服务器上安装WAS 7.0,选择"Node Agent"组件,将其注册到已安装的集群管理器下。 5. 集群搭建 - **创建集群**:在集群管理器中,通过管理控制台(Admin Console)创建新的集群,定义集群名称和属性。 - **添加集群成员**:将应用程序服务器节点添加到集群中,设置节点属性,确保它们能够与集群管理器通信。 6. JDBC配置 - **创建JDBC提供程序**:定义数据源的JDBC驱动,如Oracle、MySQL等。 - **配置数据源**:为应用程序配置数据源,包括数据库连接池参数,确保应用程序能访问数据库。 7. 发布应用程序 - **创建虚拟主机**:定义应用程序的运行环境,可以有多个虚拟主机以区分不同应用。 - **安装应用程序**:将WAR或EAR文件部署到集群,可以选择特定的集群或虚拟主机。 - **配置服务器**:根据需求调整服务器设置,如安全、性能、日志等。 8. 服务器重启与应用程序启动 - **启动节点**:通过管理控制台或命令行工具启动集群中的各个节点。 - **启动集群**:启动整个集群,确保所有成员服务器在线。 - **启动应用程序服务器**:在每个节点上启动承载应用程序的服务器实例。 集群搭建完成后,系统具备了高可用性,当单个服务器出现故障时,其他服务器可以接管服务,保证业务连续性。同时,负载均衡机制可以有效分配请求,避免单点过载。这种部署方式对于处理大量并发请求和需要高稳定性的企业级应用非常适用。

Based on the following story, continue the story by writing two paragraphs, paragraph 1 beginning with "A few weeks later, I went to the farm again. " and paragraph 2 beginning with "I was just about to leave when the hummingbird appeared."respectively with 150 words. I was invited to a cookout on an old friend's farm in western Washington. I parked my car outside the farm and walked past a milking house which had apparently not been used in many years.A noise at a window caught my attention,so I entered it. It was a hummingbird,desperately trying to escape. She was covered in spider-webs and was barely able to move her wings. She ceased her struggle the instant I picked her up. With the bird in my cupped hand, I looked around to see how she had gotten in. The broken window glass was the likely answer. I stuffed a piece of cloth into the hole and took her outside,closing the door securely behind me. When I opened my hand, the bird did not fly away; she sat looking at me with her bright eyes.I removed the sticky spider-webs that covered her head and wings. Still, she made no attempt to fly.Perhaps she had been struggling against the window too long and was too tired? Or too thirsty? As I carried her up the blackberry-lined path toward my car where I kept a water bottle, she began to move. I stopped, and she soon took wing but did not immediately fly away. Hovering,she approached within six inches of my face. For a very long moment,this tiny creature looked into my eyes, turning her head from side to side. Then she flew quickly out of sight. During the cookout, I told my hosts about the hummingbird incident. They promised to fix the window. As I was departing, my friends walked me to my car. I was standing by the car when a hummingbird flew to the center of our group and began hovering. She turned from person to person until she came to me. She again looked directly into my eyes, then let out a squeaking call and was gone. For a moment, all were speechless. Then someone said, “She must have come to say good-bye.”

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